Random and independent samples of 90 recent primetime airings from each of the two major networks have been considered. The first network aired a mean of 110.7 commercials during prime time, with a standard deviation of 4.3 commercials. The second network aired a mean of 109.3 commercials, with standard deviations of 4.6 commercials. As the sample sizes are quite large, the population standard deviation can be estimated using the sample standard deviation. Construct a 95% confidence interval for u1 -u2, the difference between the mean number of commercial u1 aired during prime time by the first network and the mean number of commercials u2 aired during prime time by the second network. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answer to at least two decimals places. Lower limit: Upper limit:

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.